Slide holder for projectors



Nov. 27, 1951 c. A. cox 2,576,714

SLIDE HOLDER FOR PROJECTORS Filed March 9, 1948 3 Sheets-Sheet l F/a 4 nv VENTOR.

CHESTER A. 00X 8) ans Mg Nov. 27, 1951 c. A. COX 7 7 SLIDE HOLDER FOR PROJECTORS Filed March 9, 1948 3 Sheets-Sheet 2 INVENTOI? CHESTER A. 00X

Nov. 27, 1951 c. A. cox 2,576,714

SLIDE HOLDER FOR- PROJECTORS Filed March 9, 1948 3 Sheets-Sheet 5 w my 7'0/1.

\ CHESTER A. 00x

By M. W 7

Patented Nov. 27, 1951 UNITED STATES PATENT OFFICE SLIDE HOLDER FOR PROJECTORS Chester A. Cox, Cleveland, Ohio Application March 9, 1948, Serial No. 13,873

8 Claims. (01. 88-27) This invention relates to apparatus for the projection 'of pictures, and more particularly to a slide holder which can be used to adapt projectors that are arranged to show single slides, for the projection of slides having a greattion circular paper discs having a plurality of colored pictures. These are most commonly used with a hand viewer and are the stereoscopic type, wherein third dimensional effect is realized. The disc bearing the pictures is placed in the viewer and is rotated by a lever to bring to view the succeeding scenes.

The present invention is particularly concerned with an adaptor which may be used in conjunction with the standard projector and enable the scenes to be projected without the third dimensional effect, thus making available to the owner of a standard projector the benefit of these pictures. The owner then can project these slides which are relatively cheap, with a minimum of expense for equipment.

Still other advantages of the invention and the invention itself will become more apparent from the following description of some embodiments thereof which description is illustrated by'the accompanying drawings and forms a part of this specification.

Fig. 1 is a side elevational view of a well known slide projector, with which the device of my invention may be used;

Fig. 2 is an enlarged fragmentary view thereof showing the device of my invention in position.

Fig. 3 is a front elevational view of the device removed from the projector and with the picture disc holder removed.

Fig. 4 is an edge elevational view thereof with I the picture disc holder in position;

Fig. 5 is a front view of a picture disc holder;

Fig. 6 is an edge view thereof;

Fig. 6a is a section taken on the line fizz-6a of Fig. 5;

Fig. 7 is a view of a picture disc;

Fig. 8 is a view of the picture disc holder and the picture disc in' assembled relation, with the picture disc braken away to show the holder;

Fig. 9 is a front elevational view of a modified form of the invention; and

Fig. 10 is an edge view thereof.

Throughout the drawings like parts have been designated by like reference characters.

Briefly speaking, my device comprises an adaptor for replacing the standard slide holder of a projector and into which the picture discs may be quickly inserted and removed. I also provide aholder for the picture disc whichincreases the useful life thereof and also since the disc holders are for three dimensional showing, blocks off certain of the pictures which would otherwise be projected upside down.

As best shown in Fig. 2, the projector includes a lamp housing I 0 containing the usual light source and condensing lens system. Supported from the base H, which also supports the housing, by an upwardly extending support I2, is the lens holder 13. The projecting lens system is supported by a barrel or mount 14 and is adjustable in the holder l3 for focusing purposes by telescoping the lens mount in the holder. The end of the lens holder l3 toward the housing 10 is provided with a square base plate l5, the plate being disposed in spaced relation to the housing. As previously stated, this structure is one which is available on the market. Normally, a slide holder for showing single slides would be mounted on the plate I5 between the plate and the housing, but in this instance, it has been removed to show the structure prior to the installation of my device.

Fig. 7 shows a picture disc which is currently available on the market. It may comprise a pair of heavy paper sheets 20 approximately 3% inches in diameter. Diametrically across the sheets from each other, there are provided picture windows 2 I and 2 la, and between the sheets and in alignment with each of the windows are the individual'pictures. Thepictures at these diametrically opposite points are the same scene taken slightly displaced from each other, to provide the three dimensional effects which are well known. The present discs have fourteen such openings to thus provide seven scenes. Intermediate the windows are rectangular openings 23 which are normally engaged by a lever in the hand viewer for advancing the picture from one scene to another.

Means is provided to support the above described picture disc and at the same time block ofi one of each of the pairs of pictures. The blocking off is desirable since otherwise, when the picture 2la ultimately got around to the position of picture 2|, it would be upside down.

In addition, this means protects the picture disc from bending or other damage. Furthermore, the picture disc is secured in a steadier manner so that it will not vibrate during projection and to prevent a blurred view as well as secure better alignment and framing of the pictures during projection. The means is embodied in a metallic; supporting disc" Mia s is" shown in Figs. 5 and 6 in whicli'are provided openings 25 spaced so that when the picture disc is in place thereon, each opening is aligned with a picture in the picture disc 20 and the alternate or upside down pictures are blocked off. A center pin for the disc is provided and-comprises a head 22, disposed at one side of. thejdisc, and having a shank 22a extending through the disc and terminating in a rounded end 221) orithe other side of the disc. Lcicating lugs 26 are spaced around the supporting diso;24,- Figs..5 and 6a,; for alignment with the openings, 23,in the picture disc 20. Whenjthepicture, disc 20.:is placed on the supporting, discm24; itcan be readily centered by the pin,e22ae,-22b which enters the center hole I9 in the disc; and the pictures will-be in proper relation to the openings 25 whe n the lugs 26 are engaged in the openings 23. Preferably, the lugs are struck from the metal of the disc and comprise an outwardlvextending portion 26;; and

a laterally extending tongue 26b, This enables the picture .disc toi berotated on thersupport disc so that the lugs 26 interlock ,with the disc adjacent openings 23 in-the holder; 7

Means for supporting the combined support a;

and picture in the projection disc is provided and includes a .carriergwhich may be formed of sheet metal and includes a pair. of spaced parallel walls 28-.29 joined together at one end by a semi-circular section 39. Lugs 3| and32 are struck out of the side 28: Each comprises an outwardly extending portion 31a which supports a channel 3lb. The channelbeing of a width to embrace the plate [5. The lugs 32 are spaced as shown to allowsufiicient space therebetween in which a hole'33 may beformed This hole is smaller than the shankZZ-a of the center pin for the support disc andgserves asabearing for engagement with the enda'22b.j Likewise; the opposite plate is provided witha large opening 34. the edge of which engages with andprovides abearingsurface for the1head,2-2 of the. centering pin. A stop lug 35 is also struck fromithesi'de 28'. This log is so located. thatlthe parrier 21 can he slid down-over the plate l5 to its, proper position and there be stopped by the lug 35'which engages the upper edge of thebase plate l5.; .4 Openings 36 ..are 'cut through both of ,the; side members 28 and 29 located so: thatwhen the car rier is in place in the: projector, the openings will Extending from ofcthe sides and in 4 divergingsrelationship to eachother arepears .40 and 4|. Thediverge'nceiof theea'rs makesit easier to slide the picture-support and its "disc' into the carrier. At 'leas't-one-"of the' ears AI .is provided with a' gui'de channel 42'whi'chis wide at theedge of the ear and narrows as it extends inwardly.

4 The channel is adapted to engage and guide the head 22 of the centering pin when the disc is inserted in the carrier.

In operation, the carrier is placed in position by engaging the lugs 3'! and 32 with the plate l5 on the projector after which the carrier is slid down between the lamp housing and the lens holder into a position which is determined by the stop lug 35. Thepicturdisc 20 and support disc 24 are then looked together as described. The combined discs are then inserted between the ears 49-4! until the centering pin engages in the channel .qlwhich extends suificiently close to the bearing holes 33 34 that the centering pin may be pushed from the channel into the bearing holes,rwhe, re it snaps into the holes 33-34. Then with the projecting light turned on, the support disc-with its picture disc can be turned until a picture is lined up with the openings 36 at which time it will then be projected onto "a suitable r .7 .l v. Inasmuch as the wall 28-of the holderis held in fixed relation to the base plate Hi, this serves as an index ior determining the correct position ing of the pictures in the lens system for proper projection thereof. Since the wall 29 is flexibly connected to the wall 28 by the section 30, it can readily be sprung apart the ears 40-4 l for removal oi the picture, Thedivergence of the ears is sufficient to enablethe centering pin to be inserted, therebetween upon insertion of the support discjin the device without pushing theears apart. The centering pin engaging in the holes 33.34 also positions the; picture in properreiation to the lens system being held securely bythe resiliency of thewall 29 through its connection 39. The part 3 0;may be upsetas shownat 39a, to provide additional stiffness thereto it desired.

A modification oimy invention for use with a difierent type of projector in -which the slide holder is mounted in a socketthe projector shown in Figs. 9 and; 10. ln this modification, the slidelugs 3i and 32: and1stop lug 34 are eliminated. ,Instead the gearrier isjconstructed with a socket engaging portion 43 which is so formed that it may be inserted into the slide-holder mounting socket on the projector. This socket engaging portion 43 may belprovided with a detent opening 44 which engfageswith a springdetent on the projector and,.;which serves to locate the carrier initspropjer position relative to the light source and lens systemsfiof the projector: In this instance, since the device is engaged on opposite sides by. the socket; on the projector, the walls 29' and 29" cannotmove relative to each other. Furthermore, since the spa'icingkbetwe'en the walls 28- ;'29 must:b'e;fixed in order to properly engagegwith the socket;- the spacing happens to be greater than inithegcase of the previous embodiment Therefore; the ear AOGwhich is somewhatdonger than theear. 40 isconnected to tongue 52 V thusprovide's-la resilient spr n y up;

port-I for homing-the; nteri g;- ninifiher i m and 22b of which engages in the opening 55. The

operation of this device is essentially the same as described before, except that instead of sliding the slide lugs 31 and 32 down over late IS, the socket engaging portion 43 is inserted into the socket on the projector until the detent opening 44 engages the detent on the projector, at which point the openings 35 are properly aligned with the lens system.

It will thus be seen that I have provided a device which may be adapted to a standard picture projector for the projection of commercially made pictures, thus making available to the public a wide variety of subjects in a very economical manner.

The construction is such that even the least mechanically minded persons can install or remove the same without tools and in a minimum of time. By using the standard projection, the cost of an additional projector for these types of pictures is eliminated, thus resulting in a great savings to the consumer, as well as reducing the amount of equipment which would otherwise be necessary. Furthermore, the device does not mutilate or otherwise harm the pictures and prevent subsequent use in the manner intended.

Having thus described my invention in some embodiments thereof, I am aware that numerous and extensive departures may be made therefrom without departing from the spirit or scope of .the invention as circumscribed by the following claims.

I claim:

1. An adaptor for engagement in a projector comprising in combination a carrier member adapted to be mounted on the projector and having a pair of spaced parallel walls, said walls being formed to provide projection openings in alignment with each other and the optical system of the projector, and a slide holder supported removably in said carrier member, a guide pin carried by said slide holder, said spaced walls having diverging extensions and at least one of said extensions being formed to provide a groove for guiding said guide pin into place upon insertion of said slide holder into said carrier member.

2. An adaptor for engagement in a projector comprising in combination a carrier member adapted to be mounted on the projector and having a pair of spaced parallel walls, said walls being formed to provide projection openings in alignment with each other and the optical system of the projector, and a slide holder supported removably in said carrier member, a guide pin carried by said slide holder, said spaced walls having diverging extensions and at least one of said extensions being formed to provide a groove for guiding said guide pin into place upon insertion of said slide holder into said carrier member, and said walls formed with detents in alignment with said groove for receiving said guide pin.

3. An adaptor for engagement in a projector comprising in combination a carrier member adapted to be mounted on the projector and having a pair of spaced parallel walls, said walls being formed to provide projection openings in alignment with each other and the optical system of the projector, and a slide holder supported removably in said carrier member, a guide pin carried by said slide holder, said spaced walls having diverging extensions and at least one of said extensions being formed to provide a groove for guiding said guide pin into place upon insertion of said slide holder into said carrier member, and said walls formed with detents in alignment with 6- said groove for receiving said guide pin, at least one of said walls being formed of flexible material. adapted to be sprung away from the other wall to release said guide pin from said detents.

4. For adapting stereoscopic slides for projection in a slide projector, said stereoscopic slides comprising circular picture discs having pairs of pictures mounted thereon, one of each pair being disposed in diametric opposition to its mate; an adaptor including a carrier member mounted on the projector, means for holding said picture discs and for blocking off one of each pair of the stereoscopic pictures comprising a supporting disc of stiff material having openings formed therein for registration with one of each pair of pictures and the portions of the supporting disc between said openings blocking off the alternate pictures, lugs on said supporting disc for interlocking engagement with openings in the picture disc to hold the picture disc and maintain the said registration, a pin for the center of said supporting disc for engagement in a center opening on the picture disc and engaging said carrier member to hold said supporting disc in position.

5. For adapting stereoscopic slides for projection in a slide projector, said stereoscopic slides comprising circular picture discs having pairs of pictures mounted thereon, one of each pair being disposed in diametric opposition to its mate; an adaptor including a carrier member mounted on the projector, means for holding said picture discs and for blocking off one of each pair of the stereoscopic pictures comprising a supporting disc of stiff material having openings formed therein for registration with one of each pair of pictures and the portions of the supporting disc between said openings blocking off the alternate pictures, lugs on said supporting disc for interlocking engagement with openings in the picture disc to hold the picture disc and maintain the said registration, a pin for the center of said supporting disc for engagement in a center opening on the picture disc and engaging said carrier member to hold said supporting disc in position, said carrier member being formed with a guide way for guiding the pin during insertion of said supporting disc into said carrier member.

6. For adapting stereoscopic slides for projection in a slide projector, said stereoscopic slides comprising circular picture discs having pairs of pictures mounted thereon, one of each pair being disposed in diametric opposition to its mate; an adaptor including a carrier member mounted on the projector, means for holding said picture discs and for blocking off one of each pair of the stereoscopic pictures comprising a supporting disc of stiff material having openings formed therein for registration with one of each pair of pictures and the portions of the supporting disc between said openings blocking off the alternate pictures, lugs on said supporting disc for interlocking engagement with openings in the picture disc to hold the picture disc and maintain the said registration, a pin for the center of said supporting disc for engagement in a center opening on the picture disc and engaging said carrier member to hold said supporting disc in position, said carrier member being formed with a guide way for guiding the pin during insertion of said supporting disc into said carrier member, and having detents in alignment with the guide way for engagement 7 the:v pin to provide: a bearing for pivotaiiy holding the supportingand picture discs.

7:. For: adapting and supporting stereoscopic slides for projection in a slide. projectors each ofsa-id; stereoscopic slides-comprising a disc having a plurality of pictures arranged for: viewing in'pairs, oneroi each of. the pairs being diametri+ cally opposed to-its mate, andrbeing formed with. openingsaadjacent the periphery for engagement; bytan. indexing. mechanism and an opening: in thecenter. for engagement with a support; anadapter comprising: a; carrier member for re-; placement of; the slide holder of the, projector including; a; pair of; spaced parallel sidQ-r Walls for locking engagement in the; projector, said ide wa lse inez qrm di ovide m e ene ingsgin alignment with each other and the optical y stemloi the prpjector, and; provided with, e; c;tensions which, diverge from each and formfin atgleast one of said. extensions being flexible and movable towardand away from they other, a guide groove formed mom of saidextensions, being. widerattheentranceand' narrowingiprogressively inwardly, and a pair of detents. formed in said wadlsin ,axialalignment. with said guide groove, and' a picture holder comprising a supporting d sc formed' with spaced picture openings arrangedjcr alignmentwith one of eachpairj of pictures 'ongthe disc; andthe' material between said openings; adapted, to 101001; off; the alternate niqi ures loc in n o n l n supe porting disc comprising members extending from th'e 'wall of the holder and then laterally arranged ifgll interlocking engagement in theholes' the picture disc, and* a center pin on said supporting disc for engagement in the center hole on; the picture disc and having ends extending out from the side of the diSQ one of saiden'ds being adapted to beguided in; said guide grooves upon insertion of saiddiscs into said carrier member and both endsbeingadaptedfor removablesupporting engagement in--- said detents;

8 For adapting-and supporting stereoscopic slides forpro'jection -in a slide-projector, each of said-: stereoscopic slides comprising: adisc having a, plurality, otpi'ctures. arranged for viewing in pairs onez-of. eachof t .e pairs-being diametrically opposed to its mate, and being'formedwith open ingssadjacent J the periphery for; engagement by an-indexing,.mechanismand an opening in the center ior-engagementzwith a support; an adaptor comprising .acarrieremember for replacement of the slidaholderof theprojector including a pair:

rag-rips and entering guides for the picture,

g orrspaced parallel: sidewalls foi lo'cking engage--v ment in -theproj'ectora said side wa'llsb eing formed to providef-raming: openingsin alignment with each other a'n'd the-optical system of the projector; and provided: with extensions which diverge from each and form finger grips and entering guides: for the p'icture; at least one of said e'xtensions being flexible and movable toward and away f-rom -thezother a guide'groove formed in one of said extensions being wide at the entrance and na'rrowing progressively inwardly, and a pair ofidetents forme'd in sa-id walls in axial alignment withsaid-guide groove; anda' picture holder comprising a supporting disc formed with spacedpic tnreiopenings arranged: for alignm'e'nt' with one of ea'cln pain of pictures onthe disc" and the mate rial: between: said openings adapted to blockoff the alternatepicture's; locking: and positioning lugseom thesupporti-ng disc comprisingmembers extending from. the wall ofl the holder: and then laterally, arranged for interlocking engagement in the holes in the picture disc, and a center pinorr. said; supporting: disc for engagement in: the centerehole onflthe picture: disc and having ends extendingeout from'the side of: the. disc, one: of said ends beings: adapted-t to be guided" in said guide grooves rupontinsertion-zoi saidndiscs into saidcarsrier; membersandiboth ends. bjeingziadaptedhfor ree mevablmsupporting engagement in said: detents; oneiofl-saidadetents beingiormed-with a resilient tongue struck from one of said walls, said tongue being movable by one of said extensions;

CHESTER A. COX.

REFERENCES CITED The follcwing references are of reco'rd: in the file 'ofsthis patent? UNITED STATES PATENTS 

